Rock.Web.UI.Controls.SlidingDateRangePicker.CreateChildControls C# (CSharp) Method

        protected override void CreateChildControls()
        {
            base.CreateChildControls();
            Controls.Clear();
            RockControlHelper.CreateChildControls( this, Controls );

            _ddlLastCurrent = new DropDownList();
            _ddlLastCurrent.CssClass = "form-control input-width-md js-slidingdaterange-select slidingdaterange-select";
            _ddlLastCurrent.ID = "ddlLastCurrent_" + this.ID;
            _ddlLastCurrent.SelectedIndexChanged += ddl_SelectedIndexChanged;

            _nbNumber = new NumberBox();
            _nbNumber.CssClass = "form-control input-width-sm js-number slidingdaterange-number";
            _nbNumber.NumberType = ValidationDataType.Integer;
            _nbNumber.ID = "nbNumber_" + this.ID;
            _nbNumber.Text = "1";

            _ddlTimeUnitTypeSingular = new DropDownList();
            _ddlTimeUnitTypeSingular.CssClass = "form-control input-width-md js-time-units-singular slidingdaterange-timeunits-singular";
            _ddlTimeUnitTypeSingular.ID = "ddlTimeUnitTypeSingular_" + this.ID;
            _ddlTimeUnitTypeSingular.SelectedIndexChanged += ddl_SelectedIndexChanged;

            _ddlTimeUnitTypePlural = new DropDownList();
            _ddlTimeUnitTypePlural.CssClass = "form-control input-width-md js-time-units-plural slidingdaterange-timeunits-plural";
            _ddlTimeUnitTypePlural.ID = "ddlTimeUnitTypePlural_" + this.ID;
            _ddlTimeUnitTypePlural.SelectedIndexChanged += ddl_SelectedIndexChanged;

            _drpDateRange = new DateRangePicker();

            // change the inputsClass on the DateRangePicker to "" instead of "form-control-group";
            _drpDateRange.InputsClass = "";
            _drpDateRange.CssClass = "js-time-units-date-range slidingdaterange-daterange";
            _drpDateRange.ID = "drpDateRange_" + this.ID;

            Controls.Add( _ddlLastCurrent );
            Controls.Add( _nbNumber );
            Controls.Add( _ddlTimeUnitTypeSingular );
            Controls.Add( _ddlTimeUnitTypePlural );
            Controls.Add( _drpDateRange );

            PopulateDropDowns();
        }